1. Division of Gastroenterology and Hepatology, Department of Medicine; Nihon University School of Medicine; Tokyo Japan
2. Department of Gastrointestinal Oncology; Osaka Medical Center for Cancer and Cardiovascular Disease; Osaka Japan
3. Endoscopy Division; National Cancer Center Central Hospital; Tokyo Japan
4. Center for Gastroenterology; Teine Keijinkai Hospital, Kobe Hospital; Sapporo Japan
5. Department of Gastroenterology; Kobe University School of Medicine; Kobe Japan
6. Department of Gastroenterology; Ishikawa Prefectural Central Hospital; Kanazawa Japan
7. Depatment of Medicine and Bioregulatory Science, Graduate School of Science; Kyushu University; Fukuoka Japan
8. Cancer Institute Hospital of the Japanese Foundation of Cancer Research; National Cancer Center Hospital East; Kashiwa Japan
9. Endoscopy division, Department of Gastroterology; National Cancer Center Hospital East; Chiba Japan
10. Department of Gastroenterology; Kochi Red Cross Hospital; Kochi Japan
11. Division of Gastroenterology and Hepatology, Department of Medicine; University of Malaya; Kuala Lumpur Malaysia
12. Department of Gastroenterology and Hepatology; Chi-Mei Medical Center; Tainan Taiwan